Degradation of high-power LEDs — Luminous flux and TM 21 life time

The reliability and the life time prediction are still one of the most important issues when we think about LEDs. The examination of these topics represents one of the goals of a joint project between research institutions and German lighting industry companies. We try to give answers to these questions using the state of the art approaches of accelerated life time tests and try to verify how the life time prediction methodology used at the moment fits with reality.